<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
// +----------------------------------------------------------------------
namespace Think;

class Page
{
  public $firstRow; // 起始行数
  public $listRows; // 列表每页显示行数
  public $parameter; // 分页跳转时要带的参数
  public $totalRows; // 总行数
  public $totalPages; // 分页总页面数
  public $rollPage = 11;// 分页栏每页显示的页数
  public $lastSuffix = true; // 最后一页是否显示总页数

  protected $p = 'p'; //分页参数名
  protected $url = ''; //当前链接URL
  protected $nowPage = 1;

  // 分页显示定制
  protected $config = array(
    'header' => '<span class="rows">共 %TOTAL_ROW% 条记录</span>',
    'prev' => '<<',
    'next' => '>>',
    'first' => '1...',
    'last' => '...%TOTAL_PAGE%',
    'theme' => '%FIRST% %UP_PAGE% %LINK_PAGE% %DOWN_PAGE% %END%',
  );

  /**
   * 架构函数
   * @param array $totalRows 总的记录数
   * @param array $listRows 每页显示记录数
   * @param array $parameter 分页跳转的参数
   */
  public function __construct($totalRows, $listRows = 20, $parameter = array())
  {
    C('VAR_PAGE') && $this->p = C('VAR_PAGE'); //设置分页参数名称
    /* 基础设置 */
    $this->totalRows = $totalRows; //设置总记录数
    $this->listRows = $listRows;  //设置每页显示行数
    $this->parameter = empty($parameter) ? $_GET : $parameter;
    $this->nowPage = empty($_GET[$this->p]) ? 1 : intval($_GET[$this->p]);
    $this->nowPage = $this->nowPage > 0 ? $this->nowPage : 1;
    $this->firstRow = $this->listRows * ($this->nowPage - 1);
  }

  /**
   * 定制分页链接设置
   * @param string $name 设置名称
   * @param string $value 设置值
   */
  public function setConfig($name, $value)
  {
    if (isset($this->config[$name])) {
      $this->config[$name] = $value;
    }
  }

  /**
   * 生成链接URL
   * @param  integer $page 页码
   * @return string
   */
  protected function url($page)
  {
    return str_replace(urlencode('[PAGE]'), $page, $this->url);
  }

  /**
   * 组装分页链接
   * @return string
   */
  public function show()
  {
    if (0 == $this->totalRows) return '';

    /* 生成URL */
    $this->parameter[$this->p] = '[PAGE]';
    $this->url = U(ACTION_NAME, $this->parameter);
    /* 计算分页信息 */
    $this->totalPages = ceil($this->totalRows / $this->listRows); //总页数
    if (!empty($this->totalPages) && $this->nowPage > $this->totalPages) {
      $this->nowPage = $this->totalPages;
    }

    /* 计算分页临时变量 */
    $now_cool_page = $this->rollPage / 2;
    $now_cool_page_ceil = ceil($now_cool_page);
    $this->lastSuffix && $this->config['last'] = $this->totalPages;

    //上一页
    $up_row = $this->nowPage - 1;
    $up_page = $up_row > 0 ? '<a class="prev" href="' . $this->url($up_row) . '">' . $this->config['prev'] . '</a>' : '';

    //下一页
    $down_row = $this->nowPage + 1;
    $down_page = ($down_row <= $this->totalPages) ? '<a class="next" href="' . $this->url($down_row) . '">' . $this->config['next'] . '</a>' : '';

    //第一页
    $the_first = '';
    if ($this->totalPages > $this->rollPage && ($this->nowPage - $now_cool_page) >= 1) {
      $the_first = '<a class="first" href="' . $this->url(1) . '">' . $this->config['first'] . '</a>';
    }

    //最后一页
    $the_end = '';
    if ($this->totalPages > $this->rollPage && ($this->nowPage + $now_cool_page) < $this->totalPages) {
      $the_end = '<a class="end" href="' . $this->url($this->totalPages) . '">' . $this->config['last'] . '</a>';
    }

    //数字连接
    $link_page = "";
    for ($i = 1; $i <= $this->rollPage; $i++) {
      if (($this->nowPage - $now_cool_page) <= 0) {
        $page = $i;
      } elseif (($this->nowPage + $now_cool_page - 1) >= $this->totalPages) {
        $page = $this->totalPages - $this->rollPage + $i;
      } else {
        $page = $this->nowPage - $now_cool_page_ceil + $i;
      }
      if ($page > 0 && $page != $this->nowPage) {

        if ($page <= $this->totalPages) {
          $link_page .= '<a class="num" href="' . $this->url($page) . '">' . $page . '</a>';
        } else {
          break;
        }
      } else {
        if ($page > 0 && $this->totalPages != 1) {
          $link_page .= '<span class="current">' . $page . '</span>';
        }
      }
    }

    //替换分页内容
    $page_str = str_replace(
      array('%HEADER%', '%NOW_PAGE%', '%UP_PAGE%', '%DOWN_PAGE%', '%FIRST%', '%LINK_PAGE%', '%END%', '%TOTAL_ROW%', '%TOTAL_PAGE%'),
      array($this->config['header'], $this->nowPage, $up_page, $down_page, $the_first, $link_page, $the_end, $this->totalRows, $this->totalPages),
      $this->config['theme']);
    return "<div>{$page_str}</div>";
  }
}
